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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9d0b26f5e0131b425e061e667268bc754d8809090efa858b43e4ed322e44ca' 
  AND token = '8yL62RGRad8fQ/V1DXS0WGqx2WuNgdHwlHV03QPbP0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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