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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe3678332217d569036f872812796fe2d4d97886ab7cae5a808f1771eb9b541' 
  AND token = 'oEKUetkXegSx1beiv4eVCt1QlCWG51Kir1CyqNmO5P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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