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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd63ff1f37febd04080ff12ef89985b5cbce6fc2ecbafc0d8bef4a995c369701' 
  AND token = '4T48Y1fz/AKVY4flR6YGqstyHwcTVlrnwvqCFutOjDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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