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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee2b9bf6f3362e72d8d44ca7c342270c037bf9ef634a6180d45db3f5081013a6' 
  AND token = 'VjPMSpHJM6JbRZoT7STrDPfNpVIZBmaSipRP2yNRxuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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