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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f9582961776a1f21a48ded0e8f339f633f90a76ab89a96bdcec49be3e7317f' 
  AND token = 'zFmaEj8OMFg1prxmtyQdoG34E4Wksu2pBtBuS3Q3k0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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