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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6ac33ce70d1703db9650cff918a9d3df3a7d52f12ba2c211341130573559834' 
  AND token = 'jnlbZjh6inoGNjdPRtMLYcl7n7hw4sh5jQME6t7IWtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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