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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a2dd09244e0f065e7a4307d14ae28f415bf2467d35bc3795fc897b856fb18b' 
  AND token = '/y3HDl2RiN688ncgWU/Fh1zKXhr/ZyH3qzITuI3LlH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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