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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3630733c429810441469cfc45af9e6c573bb9eb43ded936d863559c162159a' 
  AND token = 'dnlcJXiOHzzBvUwJc4Sl+e2tSZRl9RIML/k7cdq7vlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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