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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8138ccb94ae74a2674da93135c443cce7f0dd1990e576bb0793cca637efcd1aa' 
  AND token = 'hBdEOgDs1Gf4evfB/N9jQq7iNGuXHebADPEtmm11HAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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