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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e984449c35cd4873b549adc5b2d3af4c481b236e47f0d38b8f75e035dcb64e09' 
  AND token = 'aY4jpnRHHyUdDzsmFksNP308TVyA1CPUEFsIfbxeoB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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