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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464ee8bb8c8ac18664d49ae7f7b238ddb5d0684b7d121816424939e9f6aa634a' 
  AND token = 'AMzlLqFNk+QfW+E8JCKeQB1kp7/wOAubsocJS60mDWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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