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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3075f6884090cada8044961829c4f909944e88ad3647a2425fbb1602b8d6c3' 
  AND token = 'e4Wr6fRe6mzxh7S3XjldWVHEZFKh27nX4nlyrdyS4ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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