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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b5ea69cff58ff4aa400c564d2238a9e95546eef4b8169b11135e3864ff8e70' 
  AND token = 'oHsdVVTMCZWj4sjglTT4IW2Sz5D7uWN6wgNKZ78ypD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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