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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b4090da2a1f141c206e3ca62a8d2535616b12c03bd48dbd60ccfbc2f65bcf5' 
  AND token = '52k+ZK0lbavbfCmbc4mwy+JmNEeRMQ8xY9F0pF7Xgk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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