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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c199f6d360e0bcae8ac02948b4471941c4eb81a2472df26d6045a3bccd86c2e9' 
  AND token = 'UK6Ue/Pp/T4CJ9eHJkvJkZUME9YDFIZCsn7P107BUxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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