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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56556e7056bc6a46af3a0ef2e585b02e1a40d6938562bb5114b6f8c18bd09f5' 
  AND token = 'oj1DWDPSZtpv7e9HS6bqeOOwCbsCY+hfvyZWHO1+GWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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