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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c060f8032d2d5cfee0b9e921cdbb031da63f86e54f074b08e6fe5e865bbc8ae' 
  AND token = 'BBhNj7eAzLD0TBKEgteFKjHy4sIMQW9jt5pI2o/Uf8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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