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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9488108fbd6d758b0ecb28ad0fb924616dc978c7dd00fc202442e44b82d7e391' 
  AND token = 'DV5hiPporX9P5tycGMB4XLe7URPaKpfelmEr+i+WWJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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