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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a080290b76ad80f9a00d960fd0b1b446c10ca0d20254e80053882d5d616560e4' 
  AND token = '2ffRnghgaw5d/6pFPBqaPOj6B9Cyqh/Z7YL1TEn8JLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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