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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfef16ddcf1f91f49141b34ed411f622aa1431304c9a1c8d1e4b1f5240cb83d7' 
  AND token = '3d1oPsq6/yctZWzrOIVr8Xxd9KG3bMsfhrm4zrUDkoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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