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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f07a91370577c98a908bccd6d3db5055f93c27b33c5820c9b5d42bdd6d9b7de' 
  AND token = 'BI6kf4cSM5jtdRF2I9w9yjTnJq2l0UatonUinhcvyno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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