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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ac2064a19b9d014da387fd4e36fd9f7e3729026992acaea08c51572db62b85' 
  AND token = 'tZb0NyYfaTPNiYgTfkGdJsTB1ZMveVQLExg6nInW7fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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