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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cec2fc055ad282b88e03457f2b76ffbd8452c7395ff4f48959fcfb4b6801c24' 
  AND token = 'V1u90CQR+Na6SwAkZsaoupp+Asg74lomdgEeuKP+HPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}