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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1422f66393b24e528fb53754079d5eb3f6b9ed67347c85c9f4693619b20d7c1' 
  AND token = '1TfxIgDozh1gAr35WW9HcKxCZIzT48rGCf8zqwhiv6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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