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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af8a7850d93f857a19111dcff8340c2d41d1060a834f49da8486d60966bbe1d' 
  AND token = 'Sg23p6KXKR3OGJaBior6BeOGUUvFNV1G41Vt2yjd2b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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