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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8e788a90e339839a5e2d99c3b537d486471b2720c236fffff7b847bb3ab24c' 
  AND token = 'A/rxR4363EMvE+2kePiGJyHsENlAHWshVAghcUp5+gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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