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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd238e1622d5adb943b58b05fb5e22621c68f552a95a0edb56de9528f88ff854f' 
  AND token = 'tU6xb9YWGDdrq52OeafjU6V4C9wEqHvgdENRO5Ag8NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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