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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466bd1ab5bffe2b32c5fa5912d442e320cbb2d6c466fdb8e9aec331b88115c19' 
  AND token = 'bLUYBXEHgIeEm4Ix2QoRaDow2L53DldAohyiIYtTQ6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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