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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65786bc56b8dcafb38af9ee65e67e6c5f85dad606a0834245cf9c559e2fb4bea' 
  AND token = 'k7Ert0EPiftAGRXVxfOk6qKwYH9O7zNfNOtV0l8O7cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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