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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b823c95ac020f14177c3fb925755dfc89905bfb461794405131f7e77ac9fd0da' 
  AND token = '2wTiAzB4zIEUNodxVjLgSkhJECdwqr9zMXJW9SM6aNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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