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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e9f14afcd40f022f3dbc504984d12415f2737b8a1568126bfa0f018e3bd106' 
  AND token = 'AvntogiKzuIpcXTUhHDpiEAmI2w5pMwiz27CDODPau0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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