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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e7a593283cbb778313078da00cd996b67c3271dd1424a056ef80ef66aef475' 
  AND token = 'kujb4MeOz1UzQ8bpuck/qxpvgo0pm/fMqEYwJzDJSn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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