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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14272261ae07d7ac5e841be92ea496d3cfa269ed00c177f16aac9af193a87a55' 
  AND token = 'SK0f/caO3XI5KBGRwLPFrKvXE445LZwwZa9Bg8dPHD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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