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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982a6e3eb4f00dff15c8a55d6ddac91e6bb35da57e6db999a8f5feba3665eab0' 
  AND token = '+uopi0t6GW+NmnJgiMldr8bE30yXZ1ZU5Syl9nXTb+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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