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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ef084770343222ddf5f0d03a9852f93c6c2779af2e6c85cd1de2fec6bb3d64' 
  AND token = '7VElyaUevbOkGKywRr/j68euqOSsOTbD8RIVdAKBGaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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