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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fb134c6c662febd4ff26b0a61377d3b577b45671842ec36edb92cde6bf88e5' 
  AND token = 'FcED392QOVZBlpOSGdnf+UPuqm4Dra5F2EMODOsNc+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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