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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae38f7dd9eafcc61ee973e9f522f51b0ddb98a595d65e4250aa91e994bd03a89' 
  AND token = 'KWNrG9X5h0Mae/Xb8Z/otpJUFved2ceFb1n+k7xdm3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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