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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91f1cf4c34650aa5b2db36c7460e1cbf57fa622527cd02488ad8ea6c227a8a5' 
  AND token = 'AhrBcb4LcHgiMHZy+lMEspLfuzxwm/ZNxZMHcpBeySs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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