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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e7e556f359626af38ae6b6109399e1e46d9d34f891aa62d197aa8d548ed066' 
  AND token = 'kLfh4A5waMcXUSPD9076Imq6pEAudNAYkth0a96gMFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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