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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ff88a6f25d7d774c61906c3ec4e62cddfc94fca9409d064bda1b88909faf39' 
  AND token = 'qkTJER3rIvMQI/2bmu2A6nAcLveWtB6vURkTEvVxMU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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