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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c03e519bc32ddd04e3ff5482bc0682d3e1719e83ab1431125140f90f46a328' 
  AND token = 'KROIa4aBO7fdOgolhhPZ3mJSU7G/GhyCOssg2mrc5ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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