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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3862d81683cd98ab12fa090dd963645a419962cf5ed162f0a74c18b93b53ca0c' 
  AND token = 'mceqbIJDvAKAoKV9ostrSYXZ7fUmXY7i7Gr9Q+tOXMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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