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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cedc90c9e0ab1151aec800072482c41e6860ee229a18e253e4d17729bfdfe1f9' 
  AND token = 'gUgK36/lMn7+YfhhcKufmAapgRdO72CdXs/AmVNEWxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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