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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e337ad8dda36007a8050b9284ee78b666d7d11aad2bd3efc3fbeef8d59ae7633' 
  AND token = 'kogT9ZmE8qqpLGnTJ+U3KPzMJcd6uvysDBalewSQ1R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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