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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bc75a9e059a657bcd0c0f0a28d2088cdbdf5b3bfe73fb08fcc361b6343c7f4' 
  AND token = 'BR30dHL3NJockT0emEynps+uySXs1rbhuHxPz2NxQ7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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