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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9ae720177278f0fa25c411c70b7029643ad6996e2ecaed3fb64e613d6b4904' 
  AND token = 'jbxZnHSXKBGw72eBlPyzXjxqUgitHBJE6jO7IwuOPuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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