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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67df548109fb24578b56c3cf57e822c62d1aba40bf7362c11488e1702d8adcf' 
  AND token = 'hUK9U7G0qazXsb/YDts7Pa4R50UTcFhf7Me8wwu90jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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