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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe89ae3c57b7790e22a822223c9f46ed9e3b2695ce96541376b4c365c91ff7f' 
  AND token = 'VD2cQTetBw5jM1JM+TeWWg8K1LVPyAutM9K8gePiako=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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