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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d99d7f69cd5a0ee4847b7f54c4ecfa3ab03dc22fc524b51b42a9b593f556faf' 
  AND token = 'VOwPDR41bNhxxpgRZNKdDv7Shl2MaVvOTJnDic/cRC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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