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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc13b85244446331fb7ea1f34914d69aa0d401995ea08f138e4458555a2175d' 
  AND token = 'T81L2FLsuvfSIqYxHw4Z6TEcM2w++z4QLy+IlmSbn3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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