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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092dd8c79c72221292fbd19d437346219e7d6a65c4159196773ccab0797e5a36' 
  AND token = 'G9HF7V7RE6EEylnlViJcpTxoGcRGyMJ1YwgcOtae55E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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