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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a328e0aa92d1eb695f3a4420a622f87c7dc52b6c445c2c7a778baac4dc1bde3' 
  AND token = 'RimFB0xFe1VCeVaiFOM4yTTvHOHTjtzXOkEfMNcR7k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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