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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccef3f7da3cc125898fbcf898c7ba6f1d5b4bf144b71b8f71e63215f21ed7f22' 
  AND token = '/T3y1DW82rs7MSS9OsVOo1sePPbuP3ZEBp1WiEU7Wc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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