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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf442d9b3e2abaff19794c160ba561e2b7355d7948aae2ab806308990670ae1' 
  AND token = 'veHWZqCQnjFrLjkda8B4hPN41kHHoM2V4Jhtox7Jyvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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