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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94eaa13b4519ba3f88fee6b174a88f57288e50871a28efb86e8fcd374b075df8' 
  AND token = '8X4/bwVvgEA1EaYJ45Jjp8hTuOac8ihTSCXlV/tfUIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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