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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c87400b32a0941b37e25b8aaeb704c7e1ed381bdef57a2d50a5b5e7255a1e0a' 
  AND token = 'Xc2moZQVfcSd7bq6reaLL/aQiBuHFeacebyQMeeyzN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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