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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1077bd86af95c806eb49b39601002297e59b51a33e69b8d0abdbe4584b6d20' 
  AND token = 'xP3AkyYOinr6HbxQMk8085Re4q5IgrWxutzKhmZkBa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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