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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d59e7bab546f4d22afd7697caeeebf0ee0abdc60ccf8988d71473a65a2a0cb2' 
  AND token = 'pwBh2nBBcKPXYTT+S45K/j/ExJek7ly+r56of7a7AD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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