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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a886c32a5d179bdc06af919895b1bd73055c43f2e88949ee0d37c5c5c6bf4f9d' 
  AND token = 'mdTtBpnD2L12kPBhcIEqMDSCVPyjykJpZw36hFoiRQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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