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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05971b7babf77f497c63822329dac834af7bcd6d88453c1f76e64a03e9b6eda2' 
  AND token = '2eU5Oq2sSDBrtQ2YFG+Kfbkz4O858jRRB835mNeFMHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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