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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98f6b6371d8971295ce5c6d7f780190c4e1c096d6e98e6377f9e19b0f133ce4' 
  AND token = 'S6F8CwxKl908VckTXk9YJ5AVcW+RhvaXa/rUM0neiEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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