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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174da3effe3e883ff71910c50ae2acdbbd8c3f367971089431b2d44c461ab491' 
  AND token = '2mZq4Fw6kgO4HyaonmVcZC7Myyk9Vo/kkBlQ+INp7f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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