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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ca1da5e52f82647d88813ca34f253ae8e0b417f14e5f4750f27a5d1ddae4bf' 
  AND token = '+J9S7TcXD+3Y6Siy3q0vM9cat/Yf336CQabIi0TxTX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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