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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d4c196f57e94154b5fabdf2fca91b4f7d33617beb8964b8b3555e3529875ad7' 
  AND token = 'YrF8NuXDTHBCBo6nY80usJ2e1Qnjwpuo7efmn6Dxcsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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